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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'f3349663a0d00a6eea7e5809ee8a7dbfda8a4169ec265740a389c33cdcd561c8' 
  AND token = 'p7HKoHWrgd8KlPm5l+LKBSNcHqaiTJ8UZ3eipXyMcUk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}